Commits
Paul Cercueil committed f4c255f1a74
dmaengine: dma-jz4780: Break descriptor chains on JZ4740 The current driver works perfectly fine on every generation of the JZ47xx SoCs, except on the JZ4740. There, when hardware descriptors are chained together (with the LINK bit set), the next descriptor isn't automatically fetched as it should - instead, an interrupt is raised, even if the TIE bit (Transfer Interrupt Enable) bit is cleared. When it happens, the DMA transfer seems to be stopped (it doesn't chain), and it's uncertain how many bytes have actually been transferred. Until somebody smarter than me can figure out how to make chained descriptors work on the JZ4740, we now disable chained descriptors on that particular SoC. Signed-off-by: Paul Cercueil <paul@crapouillou.net> Link: https://lore.kernel.org/r/20190714215504.10877-1-paul@crapouillou.net Signed-off-by: Vinod Koul <vkoul@kernel.org>